摘   要：为防止液化天然气（Liquefied natural gas，LNG）储罐混凝土开裂失效，保障混凝土结构的安全性与耐久性能，对超低温作用下预应力混凝土的变形性能进行研究十分有必要。本文研究了超低温（-160 ℃）作用下不同初始预压应力（0.2、0.3、0.4、0.5、0.6、0.7）对不同含水率（正常、较高）预应力混凝土变形性能的影响。结果表明：超低温作用下，随着初始预压应力的提高，混凝土温降点和温均点时的预压应变差率均基本降低，而其降温阶段和恒温阶段的瞬态预压应变变化率基本呈先增后减的趋势；超低温作用下混凝土的变形性能与含水率密切相关，当初始预压应力不同时，含水率的影响程度也存在明显差异。研究成果可为LNG储罐结构设计及使用性能评判提供参考。Abstract: To prevent cracking and failure of concrete in liquefied natural gas (LNG) storage tanks and ensure the safety and durability of concrete structures, it is essential to investigate the deformation performance of prestressed concrete under ultra-low temperature conditions. In this paper, the effects of different initial precompressive stress (0.2, 0.3, 0.4, 0.5, 0.6, 0.7) on the deformation performance of prestressed concrete with different moisture contents (normal, high) at an ultra-low temperature of -160 ℃ were studied. The results show that under ultra-low temperature, with the increase of the initial precompressive stress, the difference rate of precompressive strain at both the cooling target point and the uniform temperature target point of concrete basically decreases, while the transient precompressive strain change rate during the cooling stage and the constant temperature stage generally increases first and then decreases. The deformation performance of concrete under ultra-low temperature is closely related to its moisture content, and the influence of moisture content varies significantly under different initial precompressive stresses. The findings can provide a reference for the structural design and service performance evaluation of LNG storage tanks.

时旭东,田在旭,韩源海.初始预压应力对不同含水率混凝土超低温预压变形性能的影响试验研究[J].混凝土与水泥制品,2026,53(9):1-5,12. Shi Xudong,Tian Zaixu,Han Yuanhai,et al.Experimental study on the effect of initial precompression stress on ultra-low temperature precompression deformation properties of concrete with different moisture contents[J].China Concrete and Cement Products,2026,53(9):1-5,12 (in Chinese).

摘   要：在水泥水化进程中，硅酸三钙（C3S）的水化行为对水泥基材料性能的发展至关重要，但其表面缺陷对水化过程的影响机理尚不明确。鉴于此，本文基于第一性原理研究了C3S表面点缺陷对其与水分子的相互作用及水化过程的影响。结果表明：C3S表面钙缺陷降低了局部结构密度，增强了水分子在缺陷位点的吸附能，并促进了水分子的解离、吸附；钙缺陷导致表面电荷分布不均，增强了吸附过程中的电荷转移；缺陷位点的轨道杂化程度提高，进一步调控了吸附过程中的键合性质；由于钙缺陷的形成，水分子与C3S表面的氢键相互作用增强，有助于加快水泥的初期水化反应，提高水泥基材料的早期强度和耐久性能。研究成果为理解C3S微观缺陷对宏观性能的影响提供理论依据，并为通过调控点缺陷优化水泥基材料的性能提供参考。Abstract: During the cement hydration process, the hydration behavior of tricalcium silicate (C3S) is critical to the property evolution of cement-based materials. Nevertheless, the mechanism underlying the effects of its surface defects on the hydration process remains unclear. In view of this, the first-principles calculations were performed in this work to investigate the influence of point defects on the C3S surface on its interaction with water molecules and the hydration process. The results show that calcium defects on the C3S surface reduce the local structural density, increase the adsorption energy of water molecules at defect sites, and promote the dissociation and adsorption of water molecules. Calcium defects lead to inhomogeneous surface charge distribution and enhance charge transfer during adsorption. The degree of orbital hybridization at defect sites is elevated, which further modulates the bonding characteristics during adsorption. Owing to the formation of calcium defects, the hydrogen-bond interaction between water molecules and the C3S surface is strengthened, which helps accelerate the early hydration of cement and improve the early strength and durability of cement-based materials. The findings provide a theoretical basis for understanding the influence of microscopic defects in C3S on macroscopic properties and offer a reference for optimizing the performance of cement-based materials by regulating point defects.

李中娟,张悦.基于第一性原理的钙空位缺陷对M3-C3S表面水化调控机理研究[J].混凝土与水泥制品,2026,53(9):6-12. Li Zhongjuan,Zhang Yue.Study on the regulation mechanism of calcium vacancy defects on M3-C3S surface hydration based on the first-principles calculations[J].China Concrete and Cement Products,2026,53(9):6-12 (in Chinese).

王盛年,谷雷雷,李晓鹏,等.水灰比和增黏早强剂掺量对喷射混凝土工作性的影响[J].混凝土与水泥制品,2026,53(9):13-17,26. Wang Shengnian,Gu Leilei,Li Xiaopeng,et al.Influence of water-cement ratio and dosage of viscosity-increasing early strength agent on the workability of shotcrete[J].China Concrete and Cement Products,2026,53(9):13-17,26 (in Chinese).

摘   要：硫铝酸盐水泥基材料因早强、快硬等性质常用于修补加固工程，但其延性差、易开裂、缺乏压敏性能等不足限制其智能化服役。碳纳米管因其卓越的力学、电学特性具备改善硫铝酸盐水泥基材料压敏性能的潜力。因此，本文研究了不同加载工况下多壁碳纳米管（MWCNTs）对硫铝酸盐水泥基材料力学、电学、压敏性能的影响，并采用SEM分析了MWCNTs的作用机理。结果表明：掺入0.6%的MWCNTs能提高试件的3 d力学性能，降低电阻率，提高导电性能；试件的压敏性能受MWCNTs掺量、加载方式、极限载荷的影响，其中，MWCNTs掺量的影响程度最大，抗压破坏载荷对压敏性能的影响程度大于劈裂抗拉破坏载荷；当MWCNTs掺量为0.6%、加载速率为0.4 mm/min、加载幅值为6 MPa时，MWCNTs通过桥连、填充作用抑制试件中裂缝的产生和发展，通过增加应力传递路径提升承载力，改善力学性能；MWCNTs互相搭接形成导电网络增加了MWCNTs接触导电和隧道导电的发生概率，改善了试件的电学性能和压敏性能。研究成果可为智能修补加固材料的研发及应用提供参考。Abstract: Sulphoaluminate cementitious materials are widely applied in repair and reinforcement engineering owing to their properties of early strength and rapid hardening. Nevertheless, their drawbacks including poor ductility, proneness to cracking and absence of pressure-sensing capability restrict their intelligent service performance. With outstanding mechanical and electrical properties, carbon nanotubes possess the potential to improve the pressure-sensitive performance of sulphoaluminate cementitious materials. Therefore, this paper investigated the effects of multi-walled carbon nanotubes (MWCNTs) on the mechanical, electrical and pressure-sensitive performance of sulphoaluminate cementitious materials under different loading conditions, and analyzed the modification mechanism of MWCNTs via SEM. The results show that adding 0.6% MWCNTs can improve the 3-day mechanical properties of specimens, reduce electrical resistivity and enhance electrical conductivity. The pressure-sensitive performance of specimens is affected by MWCNTs content, loading mode and ultimate load, among which MWCNTs content exerts the most significant influence. Compressive failure load has a greater impact on pressure-sensitive performance than splitting tensile failure load. With an MWCNT dosage of 0.6%, a loading rate of 0.4 mm/min and a loading amplitude of 6 MPa, crack generation and expansion within the specimens are suppressed by MWCNTs through bridging and filling mechanisms, while MWCNTs increase stress-transfer paths, thereby improving bearing capacity and mechanical properties. Meanwhile, MWCNTs overlap with each other to form a conductive network, which increases the probability of contact conduction and tunneling conduction, and improves the electrical and pressure-sensitive properties of specimens.The research findings can provide a reference for the research, development and engineering application of intelligent repair and reinforcement materials.

马硕,刘帅,夏雨,等.不同加载工况下多壁碳纳米管改性硫铝酸盐水泥基材料的压敏性能研究[J].2026,53(9):18-26. Ma Shuo,Liu Shuai,Xia Yu,et al.Research on the pressure-sensitive performance of sulphoaluminate cementitious materials modified by multi-walled carbon nanotubes under different loading conditions[J].China Concrete and Cement Products,2026,53(9):18-26 (in Chinese).

摘   要：为了研究泡沫混凝土在真三轴压缩状态下的力学特性，开展了泡沫混凝土试件在不同围压组合下的真三轴压缩强度试验，通过5种典型混凝土强度准则（过-王强度准则、Willam-Warnke五参数破坏准则、Drucker-Prager破坏准则、双剪统一强度准则、Mogi-Coulomb准则），采用均方根误差、平均绝对误差、平均绝对百分比误差评价各强度准则对试件真三轴压缩强度预测的适用性。结果表明：小主应力和中主应力均对试件的真三轴压缩强度存在强化效应，其中，小主应力的影响更显著；Willam-Warnke五参数破坏准则对试件真三轴压缩强度预测表现出更好的适用性，Mogi-Coulomb准则形式简洁且精度较高，过-王强度准则在高围压条件下具有优势。Abstract: In order to study the mechanical properties of foamed concrete under true triaxial compressive, the true triaxial compression strength tests of foamed concrete specimens under different confining pressure combinations were carried out. Through 5 typical concrete strength criteria (Guo-Wang strength criterion, Willam-Warnke five-parameter failure criterion, Drucker-Prager criterion, double shear unified strength criterion, Mogi-Coulomb criterion), the applicability of each strength criterion for the prediction of true triaxial compressive strength of specimens was evaluated by using root mean square error, average absolute error, and average absolute percentage error. The results indicate that both minor principal stress and intermediate principal stress have a strengthening effect on the true triaxial compressive strength of the specimen, with the influence of minor principal stress being more significant. The Willam-Warnke five-parameter failure criterion shows better applicability in predicting the true triaxial compressive strength of specimens, while the Mogi-Coulomb criterion is concise in form and highly accurate, and the Guo-Wang strength criterion has advantages under high confining pressure conditions.

文开艳,焦治霖,梁震,等.泡沫混凝土的真三轴压缩强度准则研究[J].混凝土与水泥制品,2026,53(9):27-33. Wen Kaiyan,Jiao Zhilin,Liang Zhen,et al.Research on true triaxial compressive strength criterion of foamed concrete[J].China Concrete and Cement Products,2026,53(9):27-33 (in Chinese).

摘   要：针对严寒地区大坝混凝土在冻融循环与疲劳荷载耦合作用下的性能劣化问题，本文通过冻融循环试验与四点弯拉疲劳试验，结合Weibull分布与可靠性理论，系统研究了冻融损伤对混凝土疲劳寿命的影响规律，得到了不同冻融循环次数（0~250次）和不同应力水平（0.75、0.80、0.85）下的性能指标值，并进行了可靠度分析。结果表明：随着冻融循环次数的增加，混凝土的质量损失率增大，相对动弹性模量与静态弯拉强度显著降低；冻融损伤混凝土的疲劳寿命服从两参数Weibull分布，其形状参数和标度参数均随着冻融循环次数的增加而下降，表明混凝土的疲劳寿命离散性增大，冻融损伤会加速寿命衰减；基于可靠度理论建立的冻融损伤混凝土的可靠性概率、应力水平与设计疲劳寿命关系图，量化了安全系数与冻融循环次数的关系；冻融循环250次后，可靠性概率为95%对应的安全系数需提高至3.7~3.8。研究成果弥补了传统模型的局限性，可为寒区大坝混凝土结构的抗疲劳设计提供基于概率统计的理论依据。Abstract: Aiming at the performance degradation of dam concrete in severe cold regions under the coupled action of freeze-thaw cycles and fatigue loading, this study systematically investigates the influence of freeze-thaw damage on the fatigue life of concrete through freeze-thaw cycle tests and four-point bending fatigue tests, combined with the Weibull distribution and reliability theory. Performance indicators are obtained under different freeze-thaw cycles (0~250 cycles) and different stress levels (0.75, 0.80, 0.85), and reliability analysis is conducted. The results show that with the increase of freeze-thaw cycles, the mass loss rate of concrete increases, while the relative dynamic elastic modulus and static flexural-tensile strength decrease significantly. The fatigue life of freeze-thaw damaged concrete follows a two-parameter Weibull distribution, and both its shape parameter and scale parameter decrease with the increase of freeze-thaw cycles, indicating greater dispersion in fatigue life and that freeze-thaw damage accelerates life degradation. Based on reliability theory, the relationship diagram among reliability probability, stress level, and design fatigue life of freeze-thaw damaged concrete is established, which quantifies the relationship between safety factor and freeze-thaw cycles. After 250 freeze-thaw cycles, the safety factor corresponding to a reliability probability of 95% needs to be increased to 3.7~3.8. The findings compensate for the limitations of traditional models, and provide a probability-statistics-based theoretical basis for the anti-fatigue design of dam concrete structures in cold regions.

胡义文,徐凌一,丁玲.冻融损伤下大坝混凝土的疲劳寿命预测与可靠度分析[J].混凝土与水泥制品,2026,53(9):34-39. Hu Yiwen,Xu Lingyi,Ding Ling.Fatigue life prediction and reliability analysis of dam concrete under freeze-thaw damage[J].China Concrete and Cement Products,2026,53(9):34-39 (in Chinese).

摘   要：层布式钢纤维混凝土（layered steel fiber reinforced concrete，LSFRC）可通过分层铺设钢纤维减少纤维用量，改善混凝土的力学性能，在水泥混凝土路面工程中的应用前景良好。为进一步推动LSFRC路面技术的工程应用，本文研究了波纹钢纤维的掺量（1.0%、1.5%、2.0%）、布置层数（单层、双层）和实际用量计算厚度（20 mm、30 mm）对LSFRC力学性能与韧性的影响。结果表明：LSFRC发生劈裂抗拉和抗折破坏时，以贯穿裂缝为主；单层LSFRC试件的脆性特征比双层LSFRC试件明显，但随着钢纤维掺量与计算厚度的增加，试件的脆性特征减弱；采用合理的钢纤维布置方案可显著提升混凝土的劈裂抗拉强度与抗折强度，当钢纤维掺量为1.5%、双层布置且计算厚度为30 mm时，LSFRC试件的劈裂抗拉强度与抗折强度相对最优；LSFRC的弯曲韧性显著优于普通混凝土，实际应用时应兼顾强度与韧性指标，优选纤维布置方案。研究成果可为LSFRC路面的选材、设计及施工提供参考。Abstract: Layered steel fiber reinforced concrete (LSFRC) can reduce the amount of steel fibers and improve the mechanical properties of concrete through layered placement of steel fibers, showing promising application prospects in cement concrete pavement engineering. To further promote the engineering application of LSFRC pavement technology, this study investigated the effects of crimped steel fiber dosage (1.0%, 1.5%, 2.0%), number of placement layers (single-layer, double-layer), and calculated thickness based on actual dosage (20 mm, 30 mm) on the mechanical properties and toughness of LSFRC. The results indicate that during splitting tensile and flexural failure of LSFRC, through-cracks are the dominant failure mode. The brittle characteristics of single-layer LSFRC specimens are more pronounced than those of double-layer LSFRC specimens. However, as the steel fiber dosage and calculated thickness increase, the brittle characteristics of the specimens diminish. Adopting a reasonable steel fiber placement scheme can significantly enhance the splitting tensile strength and flexural strength of concrete. When the steel fiber dosage is 1.5%, with a double-layer placement and a calculated thickness of 30 mm, the splitting tensile strength and flexural strength of the LSFRC specimens are relatively optimal. The flexural toughness of LSFRC is significantly superior to that of ordinary concrete. In practical applications, both strength and toughness indicators should be considered comprehensively, and the fiber placement scheme should be optimized accordingly. The findings can provide a reference for material selection, design, and construction of LSFRC pavements.

丁延明,秦朝刚,徐杰,等.钢纤维布置方案对层布式钢纤维混凝土力学性能及韧性的影响[J].混凝土与水泥制品,2026,53(9):40-44,51. Ding Yanming,Qin Chaogang,Xu Jie,et al.Effects of steel fiber placement scheme on the mechanical properties and toughness of layered steel fiber reinforced concrete[J].China Concrete and Cement Products,2026,53(9):40-44,51 (in Chinese).

摘   要：针对普通3D打印混凝土抗拉强度较低、易开裂以及现有增强纤维成本高、环保性差等问题，本文以天然稻草纤维（Rice straw fibers，RSFs）为增强材料，并掺入羟丙基甲基纤维素醚（Hydroxypropyl methyl cellulose，HPMC），制备了3D打印稻草纤维增强水泥基复合材料（3D-printing rice straw fiber-reinforced cement-based composite，3DPRSFCC），研究了RSFs和HPMC的掺量对3DPRSFCC可打印性与流变性能的影响。结果表明：随着RSFs和HPMC掺量的增加，3DPRSFCC的流动度降低，最佳流动度区间为181~191 mm；适量掺入RSFs和HPMC可以显著提升3DPRSFCC打印条带的质量和打印层数，最佳掺量分别为3.5%和0.08%；掺入RSFs和HPMC能增强3DPRSFCC的流变性能。研究成果可为3DPRSFCC的配合比设计及性能优化提供参考，并助力绿色低碳 3D 打印技术在建筑工程领域的创新应用。Abstract: To address the problems of low tensile strength and susceptibility to cracking in ordinary 3D-printing concrete, as well as the high cost and poor environmental friendliness of existing reinforcing fibers, this study utilizes natural rice straw fibers (RSFs) as a reinforcing material and incorporates hydroxypropyl methyl cellulose (HPMC) to prepare a 3D-printing rice straw fiber-reinforced cement-based composite (3DPRSFCC). The effects of RSFs and HPMC contents on the printability and rheological properties of 3DPRSFCC were investigated. The results show that with increasing the contents of RSFs and HPMC, the flowability of 3DPRSFCC decreases, with the optimal flowability range being 181~191 mm. Appropriate amounts of RSFs and HPMC can significantly improve the quality of printed strips and the number of printable layers, with optimal contents of 3.5% and 0.08%, respectively. The incorporation of RSFs and HPMC enhances the rheological properties of 3DPRSFCC. The findings can provide a reference for the mix proportion design and performance optimization of 3DPRSFCC, and contribute to the innovative application of green and low-carbon 3D printing technology in the field of construction engineering.

姜德民,胡思雨,康红龙,等.稻草纤维和HPMC掺量对3D打印混凝土可打印性和流变性能的影响[J].混凝土与水泥制品,2026,53(9):45-51. Jiang Demin,Hu Siyu,Kang Honglong,et al.Effects of rice straw fiber and HPMC contents on the printability and rheological properties of 3D-printing concrete[J].China Concrete and Cement Products,2026,53(9):45-51 (in Chinese).

孙汝晓,孙浩然,丛嘉豪,等.近海寒冷地区白色清水混凝土的性能优化及表观质量控制研究[J].混凝土与水泥制品,2026,53(9):52-56. Sun Ruxiao,Sun Haoran,Cong Jiahao,et al.Research on performance optimization and apparent quality control of white fair-faced concrete in offshore cold regions[J].China Concrete and Cement Products,2026,53(9):52-56 (in Chinese).

摘   要：西北高盐渍地区预应力钢筒混凝土管（Prestressed concrete cylinder pipe，PCCP）保护层易发生Cl-侵蚀，而目前关于长期轴向拉伸荷载与腐蚀环境耦合作用下的劣化机理研究仍较为薄弱，本文以立式浇筑PCCP混凝土保护层为研究对象，设计了一种卧式轴拉侵蚀试验装置，开展了不同荷载水平与侵蚀时间下的Cl-扩散试验，探究了PCCP保护层Cl-的侵蚀演化规律。结果表明：随着侵蚀时间的增加，Cl-扩散深度和 Cl-浓度均呈缓慢增大趋势；表面Cl-浓度与侵蚀时间呈非线性正相关关系，而Cl-扩散系数与侵蚀时间呈非线性负相关关系；拉伸荷载会诱发混凝土内部微裂纹萌生、张开与扩展，裂纹延展方向与Cl-扩散方向一致，这会加速Cl-渗透进程。研究成果可为高盐渍地区PCCP保护层耐久性能设计、病害防控与服役寿命评估提供理论参考，也可为后续多因素耦合作用下耐久性能衰减模型的构建提供参考。Abstract: In the high-salinity regions of Northwest China, the protective layer of prestressed concrete cylinder pipe (PCCP) is susceptible to Cl- erosion. However, current research on the deterioration mechanisms under the coupling effect of long-term axial tensile loading and corrosive environments remains insufficient. In this study, the concrete cover of vertically cast PCCP is taken as the research object, and a horizontal axial tensile erosion testing device is designed. Chloride diffusion tests are conducted under various load levels and erosion times to investigate the Cl- erosion evolution law in the PCCP protective layer. The results indicate that with increasing erosion time, both the Cl- diffusion depth and Cl- concentration exhibit a gradually increasing trend. The surface Cl- concentration shows a nonlinear positive correlation with erosion time, whereas the Cl- diffusion coefficient exhibits a nonlinear negative correlation with erosion time. Tensile loading induces the initiation, opening, and propagation of microcracks within the concrete, and the crack propagation direction aligns with the Cl- diffusion direction, thereby accelerating the Cl- penetration process. The findings can provide a theoretical reference for the durability design, disease prevention and control, and service life assessment of PCCP protective layers in high-salinity regions, and also offer a basis for the subsequent establishment of durability degradation models under multi-factor coupling conditions.

陆云才,董晓农,窦铁生,等.长期轴向拉伸荷载与Cl-侵蚀耦合作用下PCCP混凝土保护层的Cl-扩散规律[J].混凝土与水泥制品,2026,53(9):57-61. Lu Yuncai,Dong Xiaonong,Dou Tiesheng,et al.Cl- diffusion behavior in the concrete cover of PCCP under the coupling effect of long-term axial tensile loading and Cl- erosion[J].China Concrete and Cement Products,2026,53(9):57-61 (in Chinese).

刘祎霖,肖明,徐传阳,等.密肋夹芯保温外挂墙板结构设计方法及工程应用[J].混凝土与水泥制品,2026,53(9):62-67,72. Liu Yilin,Xiao Ming,Xu Chuanyang,et al.Structural design method and engineering application of multi-ribbed sandwich insulated external wall panels[J].China Concrete and Cement Products,2026,53(9):62-67,72 (in Chinese).

摘   要：针对广澳高速公路改扩建工程软土路基易产生不均匀沉降、渗透变形等问题，为优化水泥土搅拌桩加固效果、提升桩体强度与抗渗性能，同时实现工业固废资源化利用，本文采用磷石膏复配早强剂改性水泥土，通过正交试验研究磷石膏掺量、水泥掺量及早强剂掺量对固化水泥土力学性能与渗透性能的影响。结果表明：水泥掺量对7 d和28 d无侧限抗压强度的影响最大；磷石膏掺量对7 d和28 d渗透系数的影响最显著，水泥掺量和早强剂掺量对7 d和28 d渗透系数的影响不显著；综合考虑无侧限抗压强度和渗透系数，建议最优配合比组合为A3B3C2，即磷石膏、水泥、早强剂掺量分别为10%、25%、1.0%，此时试件的28 d无侧限抗压强度和渗透系数均满足该路基工程要求。研究成果可为磷石膏在类似软土地基加固工程中的应用提供参考。Abstract: To address issues such as uneven settlement and seepage deformation in soft soil subgrades during the reconstruction and expansion project of the Guangzhou-Macao Expressway, and to optimize the reinforcement effect of cement-soil mixing piles, enhance their strength and impermeability, while simultaneously promoting the resource utilization of industrial solid waste, this study employs phosphogypsum compounded with an early-strength agent to modify the cement-soil. Orthogonal experiments were conducted to investigate the effects of phosphogypsum content, cement content, and early-strength agent content on the mechanical properties and permeability characteristics of the solidified cement-soil. The results indicate that cement content exerts the greatest influence on the 7-day and 28-day unconfined compressive strength. Phosphogypsum content shows the most significant effect on the 7-day and 28-day permeability coefficients, whereas the influences of cement content and early-strength agent content on these coefficients are not significant. Considering both unconfined compressive strength and permeability coefficient comprehensively, the optimal mix proportion is recommended as A3B3C2, namely 10% phosphogypsum, 25% cement, and 1.0% early strength agent. Under this formulation, both the 28-day unconfined compressive strength and the permeability coefficient meet the requirements of this subgrade project. The findings can provide a reference for the application of phosphogypsum in similar soft soil foundation reinforcement projects.

项许,牛智勇,栾从起,等.磷石膏复配早强剂改良滨海地区软土路基水泥土搅拌桩的试验研究[J].混凝土与水泥制品,2026,53(9):68-72. Xiang Xu,Niu Zhiyong,Luan Congqi,et al.An experimental study on cement-soil mixing piles improved by phosphogypsum compound early-strength agent in coastal soft soil subgrade[J].China Concrete and Cement Products,2026,53(9):68-72 (in Chinese).

摘   要：工程地质聚合物复合材料（Engineering geopolymer composites，EGC）具备低碳环保、力学性能良好等优势，在土木工程严苛环境中应用前景广阔，但矿渣-粉煤灰复配体系下微观结构、纤维界面特性与宏观性能之间的协同机制尚不明确。为探明矿渣掺量对EGC力学行为、孔结构及耐久性能的调控规律，本文设置了0、20%、50%、100%四组矿渣掺量梯度，系统开展了EGC力学性能、毛细吸水、氯盐浸泡试验与孔结构测试。结果表明：随着矿渣掺量的增加，EGC各龄期抗折、抗压强度持续提升，极限拉伸强度、极限拉伸应变呈先升后降趋势；无矿渣体系水化产物以N-A-S-H凝胶为主，纤维-基体界面黏结薄弱，试件无明显应变硬化特征，适量矿渣（20%~50%）可优化界面性能、发挥纤维滑移增韧效应，EGC应变硬化行为显著，过高矿渣掺量（100%）则因界面黏结过强拉断纤维，弱化了应变硬化效果；适当增大矿渣掺量可细化基体孔隙，提升微孔占比，降低大、中孔占比，有效切断水分与氯离子渗透通道，降低毛细吸水系数、表面氯离子浓度与表观氯离子扩散系数；综合强度、延性与耐久性能，该复配体系下矿渣最优掺量为50%，此掺量下多类凝胶协同作用，实现EGC力学与耐久性能协同优化。研究成果可为废渣基高延性地质聚合物复合材料的配合比设计与工程应用提供参考。Abstract:  Engineering geopolymer composites (EGC) are renowned for their low-carbon footprint and superior mechanical performance, making them highly promising for civil engineering applications under harsh service conditions. However, the synergistic mechanisms among microstructure, fiber-matrix interfacial behavior, and macroscopic performance of slag-fly ash blended EGC remain poorly understood. This study investigates the effects of slag content on the mechanical response, pore microstructure, and durability of EGC. Four slag content gradients (0, 20%, 50%, and 100%) were adopted, and systematic experiments were conducted to evaluate mechanical properties, capillary water absorption, chloride ion penetration resistance, and pore structural characteristics. The results indicate that increasing slag content continuously enhances the flexural and compressive strengths of EGC at all ages, whereas the ultimate tensile strength and strain first increase and then decrease. Slag-free mixtures predominantly form N-A-S-H gels, which create weak fiber-matrix interfaces and eliminate typical strain-hardening behavior. Moderate slag incorporation (20%~50%) effectively optimizes interfacial bonding and activates fiber slip toughening, yielding pronounced strain-hardening performance. Full slag substitution (100%) leads to excessive fiber-matrix interfacial bonding, which causes fiber fracture and weakens the strain-hardening performance of EGC. Increasing slag content refines the pore structure by increasing micropore fractions and reducing meso-and macropore proportions. Such pore refinement effectively inhibits water and chloride ion transport, thereby decreasing the capillary absorption coefficient, surface chloride ion concentration, and apparent chloride ion diffusion coefficient. Based on the combined evaluation of strength, ductility, and durability, the optimal slag content is 50%. At this content, the coexistence of multiple gel phases synergistically improves the overall mechanical properties and durability of EGC. This work provides a reliable basis for the mixture design and practical engineering application of high-ductility geopolymer composites fabricated from industrial solid wastes.

沈良,刘建东,姜其波,等.矿渣掺量调控工程地质聚合物复合材料的微观结构与氯离子传输规律[J].混凝土与水泥制品,2026,53(9):73-78,87. Shen Liang,Liu Jiandong,Jiang Qibo,et al.Microstructure and chloride ion transport behavior of engineering geopolymer composites regulated by slag content[J].China Concrete and Cement Products,2026,53(9):73-78,87 (in Chinese).

摘   要：铁尾矿砂存在颗粒形貌不规则、表面粗糙的特点，直接制备自密实砂浆易引发工作性劣化、力学性能不足等工程问题。为解决上述铁尾矿砂自密实砂浆的性能缺陷问题，本文以铁尾矿砂掺量（20%、40%、60%）、粉煤灰掺配方式（直接干混、悬浊液预处理浸泡）与掺量（5%、10%、15%）、温轮胶掺入时机（减水剂掺入前、后）、PVA纤维掺量（0.2%、0.4%、0.6%）为变量，系统开展了自密实砂浆工作性与力学性能试验，探究了多组分耦合作用规律，并建立了流动参数定量预测模型。结果表明，提升铁尾矿砂掺量会降低砂浆流动性、增强黏聚性，同时可在一定程度上提升砂浆28 d力学性能、改善材料脆性；相较于干混工艺，粉煤灰悬浊液预浸泡铁尾矿砂可有效优化砂浆流动性与28 d力学性能，但随着粉煤灰掺量的增加，砂浆流动性提升、黏聚性下降，28 d力学性能逐步衰减、材料脆性增大；温轮胶掺入会增大砂浆黏聚性、降低流动性，且掺入时机对砂浆性能影响显著，后于减水剂掺入更利于提升砂浆28 d力学性能；随着PVA纤维掺量的增加，砂浆流动性持续下降，28 d力学性能呈先升后降趋势；砂浆28 d力学性能随扩展度、V漏斗时间变化呈先升后降趋势，抗折强度对工作性参数波动更敏感；工程应用中需规避扩展度大于255 mm、V漏斗时间小于8 s的不利参数区间，以此兼顾砂浆工作性与力学性能。研究成果可为铁尾矿砂的资源化利用及铁尾矿砂自密实砂浆性能优化提供参考。Abstract: Iron tailing sand exhibits irregular particle shapes and coarse surface textures, which easily leads to poor workability and inadequate mechanical properties when directly used to prepare self-compacting mortar. To overcome the above performance deficiencies of iron-tailings sand self-compacting mortar, this study systematically conducted workability and mechanical property tests on self-compacting mortar, taking the following factors as variables: iron tailing sand content (20%, 40%, 60%), fly ash incorporation method (dry-blending and suspension pre-treatment) and content (5%, 10%, 15%), welan gum addition time (before and after superplasticizer addition) as well as PVA fiber content (0.2%, 0.4%, 0.6%). The coupling effect mechanism of multiple components was investigated, and a quantitative prediction model for flow parameters was established. The results show that increasing the content of iron tailing sand reduces the fluidity of the mortar and enhances its cohesiveness, while also improving the 28-day mechanical properties to some extent and mitigating matrix brittleness. Compared with dry-blending protocol, pre-soaking iron tailing sand via fly ash suspension can effectively optimize the fluidity and 28-day mechanical properties of the mortar. However, increasing the fly ash content leads to improved fluidity and reduced cohesiveness, gradual degradation of 28-day and amplified brittleness. The addition of welan gum increases the cohesiveness of the mortar while reducing its fluidity. Furthermore, the addition time of welan gum exerts a remarkable influence on overall performance. Introducing welan gum after superplasticizer proves more beneficial to 28-day mechanical properties development. As the PVA fiber content increases, the fluidity of the mortar decreases continuously, whereas its 28-day mechanical properties follow a pattern of first increasing and then decreasing. The 28-day mechanical properties of the mortar exhibit a pattern of first increasing and then decreasing with variations in slump flow and V-funnel time, with flexural strength demonstrating greater susceptibility to fluctuations in workability indicators. For practical engineering applications, parameter ranges featuring slump flow over 255 mm and V-funnel time shorter than 8 s should be avoided to strike a balanced trade-off between workability and mechanical properties. The research findings can serve as a reference for the resource utilization of iron tailing sand and the optimization of the performance of self-compacting mortars with iron tailing sand. 

张晓刚,刘枫,盛国华,等.粉煤灰悬浊液预浸泡改性铁尾矿砂自密实砂浆：温轮胶掺入时机与PVA纤维掺量协同调控研究[J].混凝土与水泥制品,2026,53(9):79-87. Zhang Xiaogang,Liu Feng,Sheng Guohua,et al.Self-compacting mortar with iron tailing sand modified by pre-soaking in fly ash suspension: Synergistic regulation of welan gum addition time and PVA fiber content[J].China Concrete and Cement Products,2026,53(9):79-87 (in Chinese).

摘   要：针对现有碱渣内养护技术相关研究多局限于单一混凝土体系，对材料制备工艺参数缺乏系统性优化，且碱渣内养护材料在不同水胶比混凝土中的适配机制与最优掺量尚不明确的问题，本文结合水洗改性、机械粉磨与粉煤灰复配工艺制备了碱渣内养护材料，系统探究了水固比、粉磨时间、碱渣-粉煤灰复配比例对材料胶凝活性、流动性及吸释水性能的影响，明确了最佳制备工艺参数；并通过正交试验研究了矿物掺合料比例、碱渣掺量、附加水比例对普通混凝土（Normal concrete，NC）、高性能混凝土（High-performance concrete，HPC）、超高性能混凝土（Ultra-high-performance concrete，UHPC）工作性与抗压强度的影响规律，揭示了碱渣内养护材料在不同类型混凝土中的适配机理。结果表明：碱渣内养护材料的最佳制备工艺参数为水固比8∶1、碱渣-粉煤灰复配比例2∶1、粉磨时间2 min，此时碱渣内养护材料具备良好的胶凝活性与持续稳定的释水能力；NC的最佳配合比组合为30%矿物掺合料、6%碱渣内养护材料、无附加水，HPC的最佳配合比组合为40%矿物掺合料、6%碱渣内养护材料、无附加水，UHPC的最佳配合比组合为30%矿物掺合料、2%碱渣内养护材料、无附加水。研究成果可为碱渣固废高值资源化利用及多类型混凝土性能优化提供参考。Abstract: Existing studies on soda residue-based internal curing technology are mostly limited to a single concrete system. Systematic optimization of material preparation parameters remains insufficient, and the adaptation mechanism and optimal dosage of soda residue internal curing materials in concrete with varied water-to-binder ratios have not been clarified. This study prepared soda residue internal curing materials by adopting water-washing modification, mechanical grinding and fly ash compounding treatment. The effects of water-to-solid ratio, grinding duration and soda residue-to-fly ash mixing ratio on the cementitious activity, fluidity, as well as water absorption and release performance of the materials were systematically investigated, and the optimal preparation parameters were determined. Furthermore, orthogonal experiments were conducted to explore the influences of mineral admixture proportion, soda residue dosage and additional water ratio on the workability and compressive strength of normal concrete (NC), high-performance concrete (HPC) and ultra-high-performance concrete (UHPC), thereby revealing the adaptation mechanism of soda residue internal curing materials in different types of concrete. The results show that the optimal preparation parameters are a water-to-solid ratio of 8∶1, a soda residue-to-fly ash mixing ratio of 2∶1, and a grinding duration of 2 min. Under these conditions, the soda residue internal curing materials exhibit good cementitious activity and a sustained, stable water-release capacity. The optimal mix design for NC consists of 30% mineral admixtures, 6% soda residue internal curing material and without additional water. For HPC, the optimal mix includes 40% mineral admixtures, 6% soda residue internal curing material and without additional water. For UHPC, the optimal mix comprises 30% mineral admixtures, 2% soda residue internal curing material and without additional water. The findings provide reference for high-value resource utilization of soda residue solid waste and performance optimization of different types of concrete.

赵凯月,王瑶,陈建伟,等.碱渣内养护材料性能及其在多类型混凝土中的适配性研究[J].混凝土与水泥制品,2026,53(9):88-95. Zhao Kaiyue,Wang Yao,Chen Jianwei,et al.Study on properties of soda residue internal curing materials and their adaptability in various types of concrete[J].China Concrete and Cement Products,2026,53(9):88-95 (in Chinese).

焦选文,张伟一,孙磊,等.燃煤炉渣掺量与水胶比对混凝土自收缩性能耦合影响及预测模型[J].混凝土与水泥制品,2026,53(9):96-101. Jiao Xuanwen,Zhang Weiyi,Sun Lei,et al.Coupling effects of coal bottom ash content and water-to-binder ratio on the autogenous shrinkage of concrete and its prediction model[J].China Concrete and Cement Products,2026,53(9):96-101 (in Chinese).

刘林石水,洪启枫,呼星源.废弃砖渣掺量对再生泡沫混凝土干密度、抗压强度和吸水率的影响[J].混凝土与水泥制品,2026,53(9):102-105. Liu Linshishui,Hong Qifeng,Hu Xingyuan.Influence of waste brick slag content on dry density, compressive strength and water absorption of recycled foamed concrete[J].China Concrete and Cement Products,2026,53(9):102-105 (in Chinese).

摘   要：氯氧镁水泥（Magnesium oxychloride cement，MOC）作为低碳环保胶凝材料备受关注，但其快凝、高收缩等缺陷限制了其规模化应用。粉煤灰作为工业固废，有望改善上述材料的性能，且其资源化利用是建筑行业重要的发展方向。鉴于此，本文系统研究了粉煤灰掺量对MOC凝结时间、体积稳定性、抗压强度、物相组成、微观结构的影响。结果表明：随着粉煤灰掺量的增加，MOC的凝结时间延长，膨胀率减小，体积稳定性提高；当粉煤灰掺量≤20%时，可提高MOC的抗压强度，且掺量为10%时抗压强度最大；粉煤灰掺入后，28 d时，MOC中的主要水化产物（5·1·8相）含量略有降低，但物相组成不变；粉煤灰的掺入使5·1·8相热分解温度降低，结晶形态由针状变为凝胶状；适当掺入粉煤灰（建议10%）可以降低MOC中有害孔含量，降低总孔隙率，优化孔隙结构。研究成果可为粉煤灰的高值化利用及MOC的改性研究提供参考。Abstract: Magnesium oxychloride cement (MOC), a low-carbon and eco-friendly cementitious material, has attracted extensive attention. However, its drawbacks such as rapid setting and high shrinkage restrict its large-scale application. As an industrial solid waste, fly ash is expected to improve the properties of MOC. Meanwhile, the resource utilization of fly ash represents an important development trend in the construction industry. In view of this, this paper investigated the effects of fly ash content on the setting time, volume stability, compressive strength, phase composition and microstructure of MOC. The results show that with the increase of fly ash content, the setting time of MOC is prolonged, the expansion rate is reduced, and the volume stability is improved. When the fly ash content is no more than 20%, the compressive strength of MOC can be increased, reaching the maximum at 10% content. After incorporation of fly ash, the content of the main hydration product 5·1·8 phase in MOC decreases slightly at 28-day, while the phase composition remains unchanged. The addition of fly ash lowers the thermal decomposition temperature of the 5·1·8 phase and changes its crystalline morphology from acicular to gel-like. Proper addition of fly ash (10% is recommended) can reduce the content of harmful pores, decrease the total porosity and optimize the pore structure of MOC. The findings can provide a reference for high-value utilization of fly ash and modification of MOC.

余江枫,王南,李静怡,等.粉煤灰掺量对氯氧镁水泥凝结时间、体积稳定性和微观结构的影响[J].混凝土与水泥制品,2026,53(9):106-111. Yu Jiangfeng,Wang Nan,Li Jingyi,et al.Effect of fly ash content on setting time, volume stability and microstructure of magnesium oxychloride cement[J].China Concrete and Cement Products,2026,53(9):106-111 (in Chinese).

胡东康,胡楠,张蕾,等.水化热和体积变形协同调控下电缆隧道混凝土裂缝控制研究[J].混凝土与水泥制品,2026,53(9):132-138. Hu Dongkang,Hu Nan,Zhang Lei,et al.Study on crack control of cable tunnel concrete under the cooperative regulation of hydration heat and volume deformation[J].China Concrete and Cement Products,2026,53(9):132-138 (in Chinese).

摘   要：在我国混凝土电杆行业整体朝着绿色低碳、高质量方向发展的趋势下，GB/T 4623—2014《环形混凝土电杆》中的部分技术条款已滞后于行业发展现状，难以适配当前生产与应用需求，亟需对其进行修订，以推动电力行业高质量发展。GB/T 4623—2025《环形混凝土电杆》基于我国环形混凝土电杆的实际生产和使用现状，参考国外相关行业的先进生产技术，并考虑行业的绿色低碳、高性能、自动化、国际化等需求，对GB/T 4623—2014《环形混凝土电杆》进行了修订，为便于该标准的使用方准确理解标准条款的具体含义，正确贯彻实施标准的具体要求和规定，本文介绍了标准的修订背景和意义，并对标准的主要条款进行了解读。新版标准已于2025年10月31日发布，2026年5月1日实施。新版标准发布实施后，将有效提升混凝土电杆的产品质量与使用性能，拓宽产品应用领域与市场空间，助力企业绿色健康可持续发展，推动行业产品国际化发展与对外合作。Abstract: Against the backdrop of China’s concrete pole industry generally moving towards a green, low-carbon, and high-quality development direction, certain technical provisions in GB/T 4623—2014 Circular concrete pole have lagged behind the current state of industry development, making them difficult to adapt to existing production and application needs. There is an urgent need to revise the standard to promote the high-quality development of the power industry. The edition of GB/T 4623—2025 Circular concrete pole is based on the actual production and usage status of circular concrete poles in China, with reference to advanced production technologies from related foreign industries, and taking into account the industry’s needs for green and low-carbon solutions, high performance, automation, and internationalization. To facilitate accurate understanding of the specific meanings of the standard’s provisions by its users and to ensure proper implementation of its requirements and regulations, the background and significance of the revision were introduced, and an interpretation of key provisions of the standard was provided. The new edition was issued on October 31, 2025, and will be implemented on May 1, 2026. Following the issuance and implementation of the new edition, it will effectively enhance the product quality and service performance of concrete poles, broaden their application fields and market space, support the green and sustainable development of enterprises, and promote the internationalization of industry products and foreign cooperation.

潘从玲,程佳佳,夏如茜,等.GB/T 4623—2025《环形混凝土电杆》主要条款解读[J].混凝土与水泥制品,2026,53(9):139-145. Pan Congling,Cheng Jiajia,Xia Ruxi,et al.Interpretation of key provisions of GB/T 4623—2025 Circular concrete pole[J].China Concrete and Cement Products,2026,53(9):139-145 (in Chinese).

摘   要：国家标准GB/T 47077—2026《矿物掺合料有效碱含量试验方法》已于2026年1月28日正式发布，2026年8月1日起实施。为便于该标准的使用方准确理解标准条款的具体含义，正确贯彻实施标准的具体要求和规定，本文介绍了标准的制定背景和意义，并基于多种矿物掺合料的试验验证应用分析，对标准的主要条文进行了详细解读说明。Abstract:  The national standard GB/T 47077—2026 Test method for available alkali content of mineral admixtures was officially issued on January 28, 2026, and will be implemented on August 1, 2026. To facilitate users of the standard in accurately understanding the specific meanings of its clauses and correctly implementing the specific requirements and provisions of the standard, the background and significance of the standard’s development are introduced in this paper. Moreover, based on the experimental verification and application analysis of various mineral admixtures, a detailed interpretation and explanation of the main clauses of the standard is provided.

路珏,冷发光,夏京亮,等.GB/T 47077—2026《矿物掺合料有效碱含量试验方法》主要条款解读与验证应用[J].混凝土与水泥制品,2026,53(9):146-152. Lu Jue,Leng Faguang,Xia Jingliang,et al.Interpretation of key provisions and validation application of GB/T 47077—2026 Test method for available alkali content of mineral admixtures[J].China Concrete and Cement Products,2026,53(9):146-152 (in Chinese).

华靖文,刘涛,杨萍,等.预制混凝土构件回弹法专用测强曲线适用性研究:以西安地区为例[J].混凝土与水泥制品,2026,53(9):153-157,164. Hua Jingwen,Liu Tao,Yang Ping,et al.Applicability of special testing strength curve for rebound method of precast concrete members: A case study of Xi’an region[J].China Concrete and Cement Products,2026,53(9):153-157,164 (in Chinese).

摘   要：传统负载型阻锈剂在混凝土中存在迁移能力弱、靶向性差、利用率低的问题。为解决上述技术难题，国内外学者借鉴医学领域磁靶向药物中的磁迁移技术，将其引入混凝土腐蚀防护领域，通过磁迁移技术赋予负载型阻锈剂靶向迁移与可控释放功能。基于此，本文结合磁靶向药物的研究现状，系统综述了磁迁移靶向防腐材料应用于钢筋混凝土腐蚀防护领域的可行性，梳理总结了该类材料的分类、合成、微观形貌及适用工况。依据功能载体类型，可将磁迁移阻锈剂体系划分为微胶囊型、层状双氢氧化物（Layered double hydroxides，LDH）型与MXene型三类。同时，本文深入剖析了磁迁移技术在钢筋混凝土实际工程应用中面临的关键问题，并针对性地提出了后续研究的重点方向。综述成果可为磁迁移靶向防腐材料在钢筋混凝土防腐领域的深化研究与工程应用提供参考。Abstract: Conventional carrier-based corrosion inhibitors suffer from weak migration capacity, poor targeting performance and low utilization efficiency in concrete. To address these technical challenges, scholars worldwide have introduced the magnetic migration technology adopted in magnetically targeted drugs in the medical field into the field of concrete corrosion protection, endowing carrier-based corrosion inhibitors with targeted migration and controlled release functions. On this basis, combined with the research progress of magnetically targeted drugs, this paper systematically reviews the feasibility of applying magnetic migration targeted anticorrosive materials to the corrosion protection of reinforced concrete, and summarizes the classification, synthesis methods, microscopic morphology and service conditions of such materials. According to the types of functional carriers, magnetic migration corrosion inhibitor systems can be classified into three categories: microcapsule type, layered double hydroxides (LDH) type and MXene type. Meanwhile, this paper deeply analyzes the key problems restricting the practical engineering application of magnetic migration technology in reinforced concrete, and puts forward targeted suggestions on future research priorities. The findings of this review can provide a reference for the in-depth research and engineering application of magnetic migration targeted anticorrosive materials in reinforced concrete.

杨恒,廉锟,熊传胜.磁迁移靶向防腐材料：腐蚀防护研究进展及在钢筋混凝土工程中的应用前景[J].混凝土与水泥制品,2026,53(9):158-164. Yang Heng,Lian Kun,Xiong Chuansheng.Magnetic migration targeted anticorrosive materials: Research progress of corrosion protection and application prospects in reinforced concrete engineering[J].China Concrete and Cement Products,2026,53(9):158-164 (in Chinese).

刘长顺,张笑天,甘保柱,等.淡水壳菜生物污损对水工混凝土的侵蚀机理及防治技术研究进展[J].混凝土与水泥制品,2026,53(9):165-170. Liu Changshun,Zhang Xiaotian,Gan Baozhu,et al.Research progress on erosion mechanism and prevention and control technologies of Limnoperna fortunei biofouling on hydraulic concrete[J].China Concrete and Cement Products,2026,53(9):165-170 (in Chinese).

摘   要：研究了纳米SiO2掺量（0、0.5%、1.0%、1.5%）对水泥基材料力学性能的影响，优选出了最佳掺量。在此基础上，进一步通过掺入纳米Ag设计制备了自感知水泥基材料，研究了其在不同应力环境（等幅值循环加载、变幅值循环加载）下的压敏性能。结果表明：随着纳米SiO2掺量的增加，试件的28 d抗折、抗压强度均先增大后减小，最佳掺量为1.0%；在等幅值循环加载工况下，试件的电阻率变化率表现为稳定的周期性波动趋势，且电阻率变化率与外力之间具有高度线性相关性，说明该水泥基材料在动态应力条件下具有优异的压敏性能和长期稳定性；在变幅值循环加载工况下，试件的电阻率变化率波动范围为-50%~-10%，其中，试件在高幅值阶段的导电网络虽然发生了重组和变化，但仍保持良好的周期性和完整性。Abstract: The influence of nano-SiO2 content (0, 0.5%, 1.0%, 1.5%) on the mechanical properties of cement-based materials was studied, and the optimal content was selected. On this basis, self-sensing cement-based materials were further designed and prepared by incorporating nano-Ag, and the piezoresistivity was studied under different stress environments (isoamplitude cyclic loading, varying amplitude cyclic loading). The results show that with the increase of nano-SiO2 content, the 28 d flexural strength and compressive strength of the specimens first increase and then decrease, and the optimal content is 1.0%. Under isoamplitude cyclic loading conditions, the resistivity change rate of the specimen exhibits a stable periodic fluctuation trend, and there is a high linear correlation between the resistivity change rate and external stress, indicating that the cement-based material has excellent piezoresistivity and long-term stability under dynamic stress conditions. Under the varying amplitude cyclic loading conditions, the fluctuation range of the resistivity change rate of the specimen is -50%~-10%. Among which, although the conductive network of the specimen undergoes reorganization and changes in the high amplitude stage, it still maintains good periodicity and integrity.

朱玉胜,姜锦磊,孙敏,等.纳米SiO2和纳米Ag对水泥基材料力学性能和压敏性能的影响[J].混凝土与水泥制品,2026(1):24-28,36. ZHU Y S,JIANG J L,SUN M,et al.Influence of nano-SiO2 and nano-Ag on mechanical properties and piezoresistivity of cement-based materials[J].China Concrete and Cement Products,2026(1):24-28,36.

摘   要：提出了一种基于最紧密堆积理论和全计算法的超高性能混凝土（Ultra-high performance concrete，UHPC）配合比优化设计方法，采用修正Andreasen-Andersen 模型（MAA模型）并结合 Matlab程序优化石英砂颗粒级配，通过全计算法对UHPC配合比进行优化，并对所制备的UHPC工作性和力学性能进行了测试。结果表明：基于最紧密堆积理论和全计算法设计制备的UHPC虽然在工作性方面有所损失，但力学性能显著提高；连续级配石英砂UHPC（LS1、LS2）的力学性能相较于单一级配石英砂UHPC（DS1~DS4）有所提高，经过全计算法优化得到的连续级配石英砂UHPC（LS2）的力学性能相较于LS1组有所提高。Abstract: A mix proportion design method of ultra-high performance concrete (UHPC) based on the closest packing theory and full calculation method was proposed, the correct Andreasen-Andersen model(MAA model) was used and combined with Matlab program to optimize the particle gradation of quartz sand, and the UHPC mix proportion was optimized by the full calculation method. The workability and mechanical properties of the prepared UHPC were tested. The results show that although the prepared UHPC based on the closest packing theory and full calculation method has a loss in workability, its mechanical properties are significantly improved. The mechanical properties of continuous gradation quartz sand UHPC (LS1, LS2) are improved compared to single gradation quartz sand UHPC(DS1~DS4), and the mechanical properties of continuous gradation quartz sand UHPC(LS2) optimized by full calculation method are improved compared to the LS1 group.

张帆,何忠茂,周楷越,等.基于最紧密堆积理论和全计算法的UHPC配合比优化设计及性能研究[J].混凝土与水泥制品,2026(1):19-23. ZHANG F,HE Z M,ZHOU K Y,et al.Mix proportion optimization design and performance study of UHPC based on the closest packing theory and full calculation method[J].China Concrete and Cement Products,2026(1):19-23.

摘   要：以抗压强度和碳减排为核心评价指标，研究了电石渣在普通混凝土中的适配性及用其制备低碳混凝土的可行性。结果表明：普通混凝土体系中，在不同掺量电石渣取代矿粉或水泥的条件下，混凝土的28 d抗压强度均满足C30要求；低水泥低碳混凝土体系中，当电石渣取代水泥掺量为5%时，混凝土28 d抗压强度满足C30要求，其碳排放量较普通C30混凝土降低了54.05%；在电石渣与石膏的协同激发下，当水泥仅占胶凝材料比例为30%时，不仅混凝土28 d抗压强度满足C30要求，且其碳排放量较普通C30混凝土降低了47.57%；在电石渣与石膏的协同激发下，当胶凝材料用量为380 kg/m3时，成功制备出了C30全固废混凝土，其碳排放量较普通C30混凝土降低了84.32%。Abstract: The adaptability of calcium carbide slag in normal concrete and the feasibility of preparing low-carbon concrete with it were investigated with compressive strength and carbon emission reduction as evaluation criteria. The results show that, in normal concrete system, the 28 d compressive strength of concrete meets the C30 requirement under the condition that calcium carbide slag replaces mineral powder or cement with different contents. In low-cement low-carbon concrete system, when calcium carbide slag replaces cement at a content of 5%, the 28 d compressive strength of concrete meets the C30 requirement, and its carbon emission decreases by 54.05%compared to normal C30 concrete. Under the synergistic activation of calcium carbide slag and gypsum, when the proportion of cement in the cementitious materials reaches only 30%, the 28 d compressive strength of the concrete meets the C30 requirement, and the carbon emission decreases by 47.57% compared to normal C30 concrete. Under the synergistic activation of calcium carbide slag and gypsum, the C30 fully solid waste concrete is successfully prepared when the cementitious material content is 380 kg/m3, with carbon emission decreases by 84.32% compared to normal C30 concrete.

张荣华,苟余江,关素敏.电石渣低碳混凝土的制备及其性能研究[J].混凝土与水泥制品,2026(1):76-80. ZHANG R H,GOU Y J,GUAN S M.Preparation and performance study of low-carbon concrete with calcium carbide slag[J].China Concrete and Cement Products,2026(1):76-80.

摘   要：研究了胶凝材料掺量（0.05、0.10、0.15、0.20、0.25、0.30，以铁尾矿质量分数为1计）、水固比（0.07、0.09、0.11、0.13、0.15、0.17）、成型压力（5、10、15、20、25、30 MPa）对铁尾矿免烧砖抗压强度的影响，并优选出最优配合比。结果表明：铁尾矿免烧砖的最佳配合比为m铁尾矿∶m熟石灰∶m胶凝材料∶m增强剂=1∶0.1∶0.20∶0.02，最佳水固比为0.15，最佳成型压力为20 MPa，此时铁尾矿免烧砖各项性能均满足相关标准中MU25强度等级的技术要求。Abstract：The effects of cementitious material content (0.05, 0.10, 0.15, 0.20, 0.25, 0.30, with iron tailings mass fraction of 1), water-to-solid ratio (0.07, 0.09, 0.11, 0.13, 0.15, 0.17), and molding pressure (5, 10, 15, 20, 25, 30 MPa) on the compressive strength of unburned bricks with iron tailings were investigated, and the optimal mix proportion was selected. The results show that the optimal mix proportion of unburned bricks with iron tailings is as follows: miron tailings∶mhydrated lime∶mcementitious material∶mreinforcing agent=1∶0.1∶0.20∶0.02. The optimal water-to-solid ratio is 0.15, and the optimal molding pressure is 20 MPa. The corresponding unburned bricks with iron tailings meet the technical requirements of MU25 strength grade in relevant standards.

杨雪超,吴志刚,韩宇栋,等.水泥基铁尾矿免烧砖的配合比及成型工艺优化研究[J].混凝土与水泥制品,2026(1):72-75,80. YANG X C,WU Z G,HAN Y D,et al.Optimization study on mix proportions and molding processes of cement-based unburned bricks with iron tailings[J].China Concrete and Cement Products,2026(1):72-75,80.

摘   要：研究了钢渣粉平均粒径（10、20、35、55 μm）对混凝土工作性、凝结时间、绝热温升、抗压强度、体积安定性、抗氯离子渗透性能和干燥收缩性能的影响，并优选出了较优平均粒径的钢渣粉用于实际大体积混凝土工程。结果表明：随着钢渣粉平均粒径的增大，混凝土的初始、1 h坍落度基本增大，初、终凝时间均延长，各龄期抗压强度、绝热温升均降低，各龄期自由膨胀率均增大，90 d劈裂抗拉强度比降低，28 d、60 d电通量增大，120 d干燥收缩值减小；基于多指标综合评估，优选平均粒径35 μm钢渣粉以30%掺量应用于实际工程，该配合比混凝土的60 d抗压强度为38.3 MPa，满足工程应用技术要求，同时通过调控水化过程实现内部温升的调控。Abstract：The effects of steel slag powder average particle size (10, 20, 35, 55 μm) on concrete workability, setting time, adiabatic temperature rise, compressive strength, volume stability, chloride ion penetration resistance, and drying shrinkage were investigated. The steel slag powder with optimal average particle size was optimized for practical mass concrete projects. The results show that, with the increase of average particle size of steel slag powder, the initial and 1 h slump of concrete generally increases, the initial and final setting times extend, the compressive strength at all ages and the adiabatic temperature rise decrease, the free expansion rate at all ages increases, the 90 d splitting tensile strength ratio decreases, the electrical flux at 28 d and 60 d increases, and the drying shrinkage value at 120 d decreases. Based on the comprehensive multi-criteria evaluation, steel slag powder with average particle size of 35 μm at a 30% content was selected for practical engineering applications. The concrete with this mix proportion has a 60 d compressive strength of 38.3 MPa, meeting the technical requirements of engineering applications, and the internal temperature rise can be controlled by regulating the hydration process.

陈健,周晓阳,刘辉.钢渣粉粒径对混凝土性能的影响及工程应用研究[J].混凝土与水泥制品,2026(1):66-71. CHEN J,ZHOU X Y,LIU H.Study on the effect of steel slag powder particle size on the performance of concrete and its engineering application[J].China Concrete and Cement Products,2026(1):66-71.

摘   要：研究了可再分散VAE乳胶粉掺量（0、3%、5%）对工程地聚物复合材料（Engineering geopolymer composite，EGC）净浆及砂浆初凝时间、流动度、抗压强度和弯曲韧性的影响。结果表明：随着VAE乳胶粉掺量的增加，EGC净浆及砂浆的初凝时间均延长，流动度和28 d抗压强度均降低；VAE乳胶粉掺量对EGC砂浆弯曲韧性的影响与其体系内的纤维类型及掺量密切相关，在适宜的纤维体系配合比条件下，适量的VAE乳胶粉能在一定程度上提升EGC砂浆的弯曲韧性。Abstract：The effects of redispersible VAE latex powder content (0, 3%, 5%) on the initial setting time, fluidity, compressive strength, and bending toughness of engineering geopolymer composite(EGC) paste and mortar were investigated. The results show that with the increase of VAE latex powder content, the initial setting time of both EGC paste and mortar prolongs, and the fluidity and 28 d compressive strength both decrease. The effect of VAE latex powder content on the bending toughness of EGC mortar is closely related to the fiber type and content within its system. Under appropriate mix proportion of fiber systems, the incorporation of appropriate content of VAE latex powder can enhance the bending toughness of EGC mortar to a certain extent.

姚启海,王凯,张美霞,等.VAE乳胶粉对工程地聚物复合材料（EGC）性能的影响研究[J].混凝土与水泥制品,2026(1):61-65,71. YAO Q H,WANG K,ZHANG M X,et al.Research on the effect of VAE latex powder on the performance of engineering geopolymer composite (EGC)[J].China Concrete and Cement Products,2026(1):61-65,71.

摘   要：研究了NaOH溶液浓度（10、12、14、16 mol/L）对粉煤灰-高炉矿渣（Fly ash-granulated blast furnace slag，FA-GBFS）基地质聚合物力学性能的影响，并基于热重（TG-DTG）与压汞试验（MIP）分析了宏观力学性能与微观结构演化的关联。结果表明：随着NaOH溶液浓度的增加，试件的抗折、抗压强度均增加，抗折、抗压强度增长率基本呈先增后减的趋势，试件全温度区间内（24~1 000 ℃）的质量损失率增加，力学性能随质量损失率的增加而增加，强度增长因子降低，强度增长速率减缓，但保持正向增长；当面对质量的微小变化时，抗折强度的敏感性更高；随着NaOH溶液浓度的增加，试件的孔隙率降低，孔隙结构得到优化；随着NaOH溶液浓度的增加，试件的力学性能随孔隙率的增加而降低，强度增长因子的绝对值减小，强度对孔隙率的敏感度下降。Abstract: The effect of NaOH solution concentration (10, 12, 14, 16 mol/L) on the mechanical properties of fly ash- granulated blast furnace slag (FA-GBFS) based geopolymer was studied, and the correlation between macroscopic mechanical properties and microstructure evolution was analyzed based on thermogravimetric (TG-DTG) and mercury intrusion test (MIP). The results show that with the increase of NaOH solution concentration, the flexural and compressive strength of the specimens increase, and the growth rate of flexural and compressive strength basically shows a trend of first increasing and then decreasing. The mass loss rate of the specimens increases throughout the entire temperature range (24~1 000 ℃), and the mechanical properties increase with the increase of mass loss rate. The strength growth factor decreases, and the strength growth rate slows down, but maintains a positive growth. When faced with small changes in mass, the sensitivity of flexural strength is higher. As the concentration of NaOH solution increases, the porosity of the specimen decreases and the pore structure is optimized. As the concentration of NaOH solution increases, the mechanical properties of the specimen decrease with the increase of porosity, the absolute value of the strength growth factor decreases, and the sensitivity of strength to porosity decreases.

邵浩栋,范向前,王涛,等.NaOH溶液浓度对FA-GBFS基地质聚合物力学性能及微观结构的影响[J].混凝土与水泥制品,2026(1):54-60. SHAO H D,FAN X Q,WANG T,et al.Influence of NaOH solution concentration on the mechanical properties and microstructure of FA-GBFS based geopolymer[J].China Concrete and Cement Products,2026(1):54-60.

摘   要：研究了矿渣掺量（45%、50%、55%）、硼酸掺量（0、1%、2%、3%）对碱激发材料凝结时间、工作性、抗折强度、抗压强度和弹性模量的影响，并基于多目标平衡设计方法优化了碱激发材料的配合比。结果表明：随着硼酸掺量的增加，碱激发材料的初、终凝时间延长，流动度提升，抗折强度、抗压强度和弹性模量均降低；随着矿渣掺量的增加，碱激发材料的初、终凝时间缩短，流动度降低，抗折强度、抗压强度和弹性模量均提高；通过多目标平衡设计方法构建的优化模型可实现碱激发材料的力学与施工性能的协同调控，同时满足抗压强度、抗折强度、凝结时间等指标的要求。Abstract: The effects of slag content (45%, 50%, 55%) and boric acid content (0, 1%, 2%, 3%) on the setting time, workability, flexural strength, compressive strength, and elastic modulus of alkali-activated materials were investigated. The mix proportions of alkali-activated materials were optimized based on a multi-objective balanced design method. The results show that increasing the boric acid content prolongs the initial and final setting times, improves fluidity and reduces the flexural strength, compressive strength and elastic modulus. As the slag content increases, the initial and final setting times of the alkali-activated material shorten, fluidity decreases, flexural strength, compressive strength and elastic modulus all increase. The optimized model constructed based on the multi-objective balanced design method enables the mechanical properties and workability of the alkali-activated material to be regulated synergistically, thus simultaneously meeting requirements of compressive strength, flexural strength, and setting time.

姚震宇,甘星,邱立珊,等.碱激发材料性能的多目标平衡设计与优化研究[J].混凝土与水泥制品,2026(1):49-53,63. YAO Zhenyu, GAN Xing, QIU Lishan,et al.Multi-objective balanced design and optimization study on the performance of alkali-activated materials[J].China Concrete and Cement Products,2026(1):49-53,63.

摘   要：通过调整超缓凝剂掺量（1.0%、1.2%、1.4%、1.6%、1.8%、2.0%、2.2%）、粉煤灰掺量（0、10%、15%、25%）、脱附土掺量（0、20%、40%、60%、80%、100%）、砂率（36%、38%、40%、44%）优选了地铁盖挖逆作法专用混凝土配合比，并对其凝结时间、工作性与力学性能进行了测试，分析了微观形貌与水化机理。结果表明：随着超缓凝剂掺量的增加，混凝土的凝结时间延长，坍落度、扩展度均增加，7 d抗压强度降低，14~56 d抗压强度先增后降；随着粉煤灰掺量的增加，混凝土的抗压强度先增后降；随着脱附土掺量的增加，混凝土的抗压强度降低；随着砂率的提高，混凝土的抗压强度先增后降；配合比最优组合为超缓凝剂掺量1.6%、粉煤灰掺量15%、脱附土掺量40%、砂率40%，以此制备的混凝土具有良好的工作性，较高的早期抗压强度，且后期抗压强度不倒缩；超缓凝剂及矿物掺合料的掺入降低了水泥水化放热温度峰值，延长了水泥的水化进程，且不会影响混凝土后期力学性能发展。Abstract: By adjusting the dosage of super retarders (1.0%, 1.2%, 1.4%, 1.6%, 1.8%, 2.0%, 2.2%), fly ash dosage (0, 10%, 15%, 25%), detachment soil dosage (0, 20%, 40%, 60%, 80%, 100%), and sand ratio (36%, 38%, 40%, 44%), the special concrete mix proportion for subway cover excavation reverse method was optimized. The setting time, workability, and mechanical properties were tested, and the microstructure and hydration mechanism were analyzed. The results show that with the increase of the dosage of super retarder, the setting time of concrete is prolonged, and the slump and expansion increase. The compressive strength decreases at 7 d, and increases first and then decreases at 14~56 d. With the increase of fly ash dosage, the compressive strength of concrete first increases and then decreases. With the increase of detachment soil dosage, the compressive strength of concrete decreases. With the increase of sand ratio, the compressive strength of concrete first increases and then decreases. The optimal mix proportion is 1.6% dosage of super retarder, 15% dosage of fly ash, 40% dosage of detachment soil, and 40% of sand ratio. The concrete prepared from this has good workability, high early compressive strength, and no shrinkage in later compressive strength. The addition of super retarders and mineral admixtures reduces the peak heat release temperature of cement hydration, prolongs the hydration process of cement, and does not affect the later mechanical performance development of concrete.

梁增蕴,侯伟芳,杨仁和,等.地铁盖挖逆作法专用混凝土的制备与性能研究[J].混凝土与水泥制品,2026(1):95-100. LIANG Z Y,HOU W F,YANG R H,et al.Preparation and performance study of special concrete for subway cover excavation reverse method[J].China Concrete and Cement Products,2026(1):95-100.

摘   要：依托某深大基坑工程，研究了混凝土支撑双向伺服调控系统的变形控制效果，分析了基坑的围护结构位移、支撑的轴力及变形、围檩脱开量的变化情况，并利用Midas软件建立了有限元模型进行了数值模拟与验证。结果表明：双向伺服调控系统能有效控制基坑两侧围护结构的变形发展，适用于敏感环境深大基坑多侧变形控制，且伺服调控系统对加载相应方向的围护及支撑的作用效果更为明显，推广应用前景广阔；建立的数值模型能较好地反映基坑实际施工工况，可为基坑工程施工提供一定的参考。Abstract: Based on a deep and large foundation pit project, the deformation control effect of a two-way servo control system for concrete support was studied. The displacement of the retaining structure of the foundation pit, the axial force and deformation of the support, and the changes in the detachment of the purlin were analyzed. A finite element model was established by using Midas software for numerical simulation and verification. The results show that the two-way servo control system can effectively control the deformation development of the retaining structures on both sides of the foundation pit, and is suitable for multi side deformation control of deep and large foundation pits in sensitive environments. Moreover, the servo control system has a more significant effect on the loading direction of the retaining and supporting structures, and has a broad prospect for promotion and application. The established numerical model can better reflect the actual construction conditions of foundation pits and provide a reference for foundation pit engineering construction.

张忆州,朱敏涛,闫东明,等.混凝土支撑双向伺服调控系统在某深大基坑工程中的应用研究[J].混凝土与水泥制品,2026(1):86-94,100. ZHANG Y Z,ZHU M T,YAN D M,et al.Application research of concrete support two-way servo control system in a deep and large foundation pit[J].China Concrete and Cement Products,2026(1):86-94,100.

摘   要：为了改善古石拱桥因长期服役累积损伤所引起的整体承载能力降低问题，采用增大截面法对某现存服役古石拱桥的主拱圈底部进行加固，并建立了有限元计算模型，通过承载力富裕量、挠度、弹性屈曲稳定系数等指标，对比分析了C50混凝土和超高性能混凝土（Ultra-high performance concrete，UHPC）的加固效果。结果表明：采用C50混凝土和UHPC加固均可以有效提高古石拱桥的承载能力和稳定性，减小挠度；与C50混凝土相比，UHPC的加固效果更好。Abstract: In order to improve the overall bearing capacity reduction caused by accumulated damage during long-term service of an ancient stone arch bridge, the enlarged cross-section method was used to reinforce the bottom of the main arch ring of an existing service ancient stone arch bridge, and a finite element calculation model was established. The reinforcement effects of C50 concrete and ultra-high performance concrete (UHPC) were compared and analyzed through indicators such as excess bearing capacity, deflection, and elastic buckling stability coefficient. The results show that the use of C50 concrete and UHPC reinforcement can effectively improve the bearing capacity and stability of ancient stone arch bridges, and reduce deflection. Compared with C50 concrete, UHPC has better reinforcement effect.

张瀚升,曹三鹏,亓兴军,等.超高性能混凝土（UHPC）加固古石拱桥的力学性能有限元分析[J].混凝土与水泥制品,2026(1):81-85. ZHANG H S,CAO S P,QI X J,et al.Finite element analysis of mechanical properties of ancient stone arch bridge reinforced with ultra-high performance concrete (UHPC)[J].China Concrete and Cement Products,2026(1):81-85.

摘   要：利用ASTM C1202法、NT Build 492/RCM法及NEL法对三种市售超高性能混凝土（UHPC）基体预混料的渗透性进行了检测，以分析其适用性。结果表明：ASTM C1202电量法的测试结果均在100 C以下，难以进行更加细致的区分；NT Build 492/RCM电迁移法即使在60 V下通电500 h，试件中的氯离子显色深度也多在2 mm以内，由显色深度读数引起的测试误差较大；NEL饱盐电导率法的测试结果与现有研究结果基本吻合，考虑测试结果的区分度，该法仍是UHPC渗透性检测的首选之法，但其可靠性仍需更多的实践检验；对于无需测试氯离子扩散系数的场合，可直接采用规定测试条件下的试件电导率（或电阻率）来比较材料的渗透性高低。 Abstract: The ASTM C1202, NT Build 492/RCM and NEL test methods were used to compare the permeability of three commercial ultra-high performance concrete(UHPC) matrix premixes, and the applicability of these methods was analyzed. The results show that the ASTM C1202 electric charge method is mostly below 100 C, and it is difficult to make a more detailed distinction. For the NT Build 492/RCM electric migration test method, the chloride penetration depths after 500 h at 60 V are mostly within 2 mm together with large reading errors causing unavoidable fluctuations. The results of the NEL salt saturated conductivity method are basically consistent with the data reported in the literature, and considering the principle and the resolution, the NEL method is currently the preferred method for UHPC permeability evaluation even though its reliability still needs further practical inspections. For those cases the chloride diffusivities unnecessary, the electrical conductivity or resistivity of the UHPC can be directly employed to compare its permeability under the same testing conditions.

王增浩,魏宇桐,路新瀛.超高性能混凝土渗透性的三种电测方法比较[J].混凝土与水泥制品,2020(12):79-83. Comparison of Three Electrical Testing Methods for Evaluation of Permeability of Ultra-high Performance Concrete[J].CHINA CONCRETE AND CEMENT PRODUCT,2020(12):79-83.

摘   要：为了研究混凝土在水力劈裂过程中的断裂能变化规律，分析了水力劈裂中的各荷载做功，建立了水压力下断裂能的计算公式，开展了12组混凝土水力劈裂试验，得出了水压力对混凝土断裂能的影响规律。结果表明：水压力作用下混凝土的断裂能减小，水压力越大，混凝土的断裂能越小；混凝土在水力劈裂过程中的断裂能弱化效应不可忽略，在0.3 MPa水压力下，该弱化效应随水压力增加呈线性递增趋势。 Abstract: In order to study the influence of water pressure on fracture energy of concrete under hydraulic fracturing, the work done by each load in hydraulic fracturing test was analyzed, the calculation formula of fracture energy under water pressure was established, and 12 groups of hydraulic fracturing tests of concrete were carried out. The results show that the fracture energy of concrete decreases under the action of water pressure, and the greater the water pressure, the smaller the fracture energy of concrete, which shows that the weakening effect of the fracture energy in the process of concrete hydraulic fracturing cannot be ignored, the weakening effect increases linearly with the increase of water pressure which not exceed 0.3 MPa.

胡少伟,王洋,孙岳阳,等.不同水压下混凝土断裂能弱化效应试验研究[J].混凝土与水泥制品,2020(12):6-10. HU S W,WANG Y,SUN Y Y,et al.Experimental Study on Fracture Energy of Concrete Under Different Hydraulic Pressure[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):6-10.

摘   要：采用RCM法、电位滴定法研究了甲酸钙对水泥砂浆中氯离子扩散系数及氯离子含量的影响，通过测定不同浸泡龄期试件的自腐蚀电位、电化学阻抗谱研究了甲酸钙对砂浆中钢筋锈蚀的影响，采用XRD、SEM分析了甲酸钙对砂浆中水泥水化产物及微观形貌的影响。研究结果表明：甲酸钙能使水泥砂浆中的氯离子扩散系数增大，并随着水胶比增大，孔隙液中自由氯离子含量提高，总氯离子含量增大；甲酸钙使水泥砂浆浸泡NaCl溶液后的Friedel盐及Ca(OH)2含量减少，溶液pH值降低，氯离子更易到达钢筋表面，加速了水泥砂浆中钢筋的腐蚀。 Abstract: RCM method and potentiometric titration method were used to study the effect of calcium formate on chloride diffusion coefficient and chloride content in cement mortar. The effect of calcium formate on the corrosion of steel bars in mortar was studied by measuring the self-corrosion potential and electrochemical impedance spectroscopy of samples with different soaking ages. The effects of calcium formate on cement hydration products and microstructure in mortar were analyzed by XRD and SEM. The results show that calcium formate increases the diffusion coefficient of chloride ions in cement mortar. With the increase of water-binder ratio, calcium formate increases the content of total chloride ions and free chloride ions in pore solution. The content of Friedel′s salt and Ca(OH)2 decreases after the cement mortar soaked in NaCl solution, and the pH value of the solution decreases, and the chloride ions are more likely to reach the surface of the steel bar. Calcium formate accelerates the corrosion of reinforcement in cement mortar.

贲询钦,蒋林华,孟远远,等.甲酸钙对砂浆抗氯离子侵蚀性能的影响[J].混凝土与水泥制品,2020(11):6-9,14. BEN X Q,JIANG L H,MENG Y Y,et al.Effect of Calcium Formate on the Resistance to Chloride Ion Erosion of Cement Mortar[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):6-9,14.

摘   要：通过自振特性测试和竖向荷载作用下的低周往复荷载试验，对比分析了倒置外露灌浆套筒装配式柱脚节点与传统现浇及现行装配式柱脚节点的整体性及抗震性能。结果表明，倒置外露灌浆套筒柱脚节点试件（NPC）的整体性与传统现浇试件（RC）基本相当，现行装配试件（TPC）测试所得的各阶自振频率基本均低于RC和NPC。三种柱脚节点在失效破坏时均出现了塑性铰，且两个装配式柱脚节点较现浇试件其塑性铰、柱身开裂高度均上移约1个灌浆套筒高度，宜适当延长箍筋加密区。三种柱脚节点的刚度退化规律相同，延性系数均在3.0以上，NPC的耗能能力显著优于RC和TPC。RC、TPC、NPC对应的开裂位移角分别为1/430、1/393、1/479，对应的极限位移角分别为1/24、1/22、1/22，均分别大于规范限值，满足抗震设防要求。 Abstract: Through test of natural vibration property and horizontal low cycle reciprocating load test under vertical load, the integrity and seismic behavior of the inverted exposed grouting sleeve prefabricated column foot joint and the traditional cast-in-place and current prefabricated column base joint were compared and analyzed. The results show that the integrity of the specimen of inverted exposed grouting sleeve column base joint (NPC) is the same as that of the traditional cast-in-place specimen (RC). The natural frequencies of current assembled specimen (TPC) are lower than those of RC and NPC. Plastic hinge appears in all three kinds of column foot joints when they failed, and the height of plastic hinge and column body crack of two prefabricated column foot joints moves up about one grouting sleeve height compared with RC, the densified area of stirrup should be extended properly. The stiffness degradation law of the specimens is the same, the ductility factors are all above 3.0, and the energy dissipation capacity of NPC is significantly better than that of RC and TPC. The corresponding crack displacement angles of RC, TPC and NPC are 1/430, 1/393 and 1/479 respectively, and the corresponding limiting displacement drift are 1/24, 1/22 and 1/22 respectively, which are greater than the code limits, meeting the seismic fortification requirements.

乔德浩,倪韦斌,王少杰,等.倒置外露灌浆套筒装配式柱脚节点抗震性能研究[J].混凝土与水泥制品,2020(8):59-64. QIAO D H,NI W B,WANG S J,et al.Seismic Behavior of Prefabricated Column Foot Joint with Inverted Exposed Grouting Sleeve[J].CHINA CONCRETE AND CEMENT PRODUCTS,,2020(8):59-64.

摘   要：针对某大型国际主题公园预制混凝土清水看台板的三折线双台阶、踏步与看台一体化预制形式，从预制方案设计、节点设计、防水设计、构件设计、混凝土配合比设计五方面阐述了看台的具体设计过程，实现了模拟弧形看台，减少看台拼缝的效果，重点解决了内凹踏步构件连接节点和防水设计难题，并保证构件达到清水效果。 Abstract: Aiming at the triple line, double stand, step and stand integrated prefabrication form fair-faced precast concrete stand plate in a certain large-scale international theme park, the precast conceptual design, connection design, waterproof design, component design and mix proportion of concrete design are studied, which effectively fulfill the simulating toward circular stand, the reducing of stand joint and resolve the key points including water recessed step connection design and waterproof design, and achieve fair-faced concrete effect.

姜广,张东阳,吕雪源,等.预制清水混凝土看台板设计研究[J].混凝土与水泥制品,2020(8):30-33,42. JIANG G, ZHANG D Y,LYU X Y,et al.Design and Application of Fair-faced Precast Concrete Stand Plate[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(8):30-33,42.

摘   要：应用RPZ2000型极坐标系3D打印机打印了多组混凝土立方体试件和长方体试件，研究了层间涂抹不同界面剂情况下对3D打印混凝土试件抗压强度与抗折强度的影响。试验结果表明，层间黏结强度的大小对3D打印混凝土试块的抗压强度影响较大，对抗折强度影响较小。水泥膨浆对3D打印混凝土具有良好的补偿收缩性，改性丙烯酸乳浆次之，水泥净浆和粉煤灰水泥净浆对打印试件的整体抗压强度提升效果一般。改性丙烯酸乳浆对打印试件整体的抗折强度提升最好，水泥膨浆次之，水泥净浆和粉煤灰水泥净浆对抗折强度几乎无任何影响。 Abstract: RPZ2000 polar coordinate system 3D printer was used to print multiple sets of concrete cube specimens and cuboid test pieces. The compressive strength of printed concrete specimens with different interface agents were applied between the layers was studied. The test results show that the strength of the interlayer bonding has a greater impact on the compressive strength of the printed concrete test block and a smaller effect on the flexural strength. Cement expansion slurry has good shrinkage compensation for 3D printed concrete, followed by modified acrylic emulsion, and cement slurry and fly ash cement slurry generally improve the overall compressive strength of printed specimens. The modified acrylic latex has the best improvement in the overall flexural strength of the printed specimens, followed by cement expansion slurry, and the flexural strength of cement slurry and fly ash cement slurry almost has no effect. 

武雷,孙远,杨威,等.3D打印混凝土层间黏结强度增强技术及试验研究[J].混凝土与水泥制品,2020(7):1-6. WU L,SUN Y,YANG W,et al.Improving Techniques and Experimental Study of Interlayer Bonding Strength of 3D Printed Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(7):1-6.